Overhead crossing



D. B. LUTEN.

OVERHEAD CROSSING. APPLIFATION F|LEn1uNE2,19|7.

Patented Mar. 2, 1920.

@an my bbo/nmmw rrn efratrne DANIEL B. LUTN, OF IN'DIANAPQLIS, INDIANA.

ernennen ennesimo.

Specification of Letters Patent. lllgrll'm'led ll'lnr. 2329 1920.

Application led tune 2, 19t?. Serial No. llt/52,352u

VTo all wiwi/L it may concern:

Be it known that I, DANIEL B. LU'rEN., a

citizen of the United'Statem residing' at In-4 4a reinforced concrete `werliead railroad crossing of general adaptabilitypof pleasing appearance, and of rigid and permanent structure at a minimum of expense for labor and materials.

rThe accompanying; drawing` illustrates my invention in its preferred form. is an elevationy with one end in section, et a railroad crossingembodying; my inventipn; Fig. E2 is a half plan of euch crossing; lijn'. is a, section on. the line 3-3 of l(1 i g. 1; lire". -1 is a Section on tl ie line #kwil-,of Fie: 1 alltel Fin'. li is a Section en tlio line 5 5 of Fig'. rllhere are two or more slender intermediate concrete jieris 10, resting' on suitable foot ings 11, and a concrete pier 12 at each end of the structure, each end pier 12 preferably comprising two Separated columns ensuit-` able footings 13. A thin floor slab of con- `crete 14 extends, preferably continuouely, from one end of the structure to the other, over the end columns 12 and the intermediate piers 10, and carriesl a suitable roadway 15. A series of arch. eantalivers 1G, of con-- crete, rest on the piers lO'and columns 12 at each side of the roadway, and "may beconn tinuous with the, floor slab 14. r1`he cantaliver arme fromfone nier abutl against and may be continuous with those from the next pier. 'llhe .eantalivers project above 'the tioor slab, so as to produce a. continuoimv cop ingr, but are arch shaped on the under eide so that they project materiallyY below the floor slab at and near the piers but are subetan-- tially flush with the under side of the floor slab midway between adjacent piers. Embedded in the upper part of the cantalivers '16 are tension rode 17, which are continuous over the piers 1() and lf2 substantially to the midway points between adjacent piers1 and may be continuous for thou-'hole length of the structure if desired. Suitable railings itl, extending' from one end of the structure to the other1 are usually mounted on the eantalivers 16.

The arch cantalivors 16 and thepiere` 10 and eoiunlms l2 carry the floor slab l/l. ln Vorderthat they may do thiS, the floor slab Figure Il f i ably these canti'tlivere 'auch rotation.

has embedded therein near itsuncler surface a numberot reinforcing rode 19 extending in oppositely obliquedirections across the floor slab from one cantaliver 1G to the other, such rode being'turned up into the cantalivers 16 at each side so that they project upward to or beyond the tension rods 17. By these op positely diagonal rods 1.97 the .load on any portion of the floor slab lat is transmitted to the cantaliverss 1G on both sides ofthe road way, andthis transmission ie always in part to pointe on euch cantalivers which are cloeer to the piers, or on the opposite side of a. pier. ll/loreorer, a load on the floor slab 14: at intermediate points 4between adjacent piers is transmitted by suoli oppoieitely diagonal rods 1t) to the lautalirere 1G projecting from both adjacent piers, so that a double Supporting action is obtained-if not a Quadruple one becauee of the cantalivers 0n both SldeS und from bothadjacent piers, making1 four in all. liy reason ot'- this transmission of forces. the floor slabmay he made Very thin, and a minimum of material may be used in the r ntalivers. The'continuity of the floor slab, and of the rods ltlrlrom the cantalivers ,lo on one sido'of the roadway from one pier to the cantalivers 1G on the i roadway and in many casses from another pier, bringe all the nearby oantalivers into nupportiiigr relation to any part of the floor alab. lhis eonthumus structure is' much stronger than Simple eantalivers, because two piers operate to support a load on the floor slab between them, i

*'ll'ie eantalivere 1li' projectnig from the end columns 12 toward the fill 20 just clear auch fill, to permit` relative movement between them and the tlll upon changes in teinperature, time avoiding' the production of undue strainri on the Structure; but prefer- 1li conform to the lill and are so clone thereto .that 'they produce the appearance of solid abutments.

ln order to prevent rotation of the piers 10 or end columns V1Q about their bases, or of tho eantaliiwrs 1G about the, upper ends; of such piers or end columns, such piers and columnav have embedded therein vertical reinlorring members 2l near both faces. 'lhese roiiperate with the tension rods 17 in the rantalivors and the roinlm'cini;l rods 19 in the tloorslah and eantalivenl to prevent VFrequenti ls up in the air, andthe approach lls are put in later; and these ills are sub.-

ject to settlement, whereby an objectionable unevenrjoint is formed between the ends of the structure and the fill. Such unevenness may also occur in the present structure by reason of the rise and fall of the free end cantalivers 16 on changes in temperature. To prevent such an uneven joint, regardless ofsuch settlement or such rise and fall, I provide at each end of the structure a cross 4beam 22, preferably provided with reinforcing rods 23 near its under face, and a cross beam 24 for embedment in the ll 2O when the latter is made, which cross beam has .upwardly extending lugs 25 at its ends; and

. ning beams 26 tilt as required so aste maintain a substantially even roadway surface between the fill andthe floor slab. By having a plurality of separated spanning beams, unequal settlement is permitted .and the spanning beams can be more readily molded and placed. The spanning beams 26 may be molded when the structure is built, and left on the AHoor slab`14 until the fill 20 is made,

and mayl then be put in place by the filling contractor, without requiring skilled labor,

fand preferably are covered with the roadway naterial to prevent wear on the concrete.

lce

I claim as my invention:

1. An elevated crossing, comprising a series of piers, a plurality of series of arch cantalivers projecting from such piers to- .ward adjacent piers, a concreto fioor slab between the series of cantalivers. and reinforcing rods embedded in said floor slab near its under face and extending through the 4floor slab in` oppositely oblique directions from one series of cantalivers to another.

2. An elevated crossing, comprising a series of piers, a plurality of seriesof cantalivers projeetingfrom such piers toward adjacent piers, a concrete 4door slab between the series of caiialliveis. and reinforcing rods embedded in said door slab near its under'face and extending through the floor slabl in oppositely oblique directions from one series of cantalivers to another. 4

An elevated crossing, comprising a i series of piers, a plurality of series of con* crete cantalivers projecting from such piers toward adjacent piers, a concrete door slab Jetween theseriesofcantalivers,and reinforcits under face and extending through the floor slab in oppositely oblique directions from one series of cantalivers to another, said cantalivers projecting both above and below the floor slab, and said reinforcing rods in the floor slab being turned upward into said cantalivcrs, said ioor slab being continuous between adjacent piers.

5. An elevated crossing, comprising a series of piers, a plurality of series of concrete cantalivers projecting from such piers toward adiacent piers, a\ concrete ioor slab between tue series of cantalivers, and reinforcin rods embedded in said door slab near its un er face and extending through the floor slab in `oppositely oblique directions from one series of cantalivers to another, said ioor slab being continuous between adjacent piers.

6. An elevated crossing, comprising a series of concrete piers, a plurality of series of concrete cantalivers projecting from such piers toward adjacent piers, a concrete ioor slab between the series of cantalivers, reinforcing rods' embedded in said Hoor slab near its under face and extending through the floor slab in oppositely oblique directions from one series of cantalivers to another, and vertical reinforcing rods in said piers near both faces.

7. An elevated crossing, comprising a series of piers, a plurality of series of canta.- livers projecting from such picrs toward adjacent piers, a plurality of ltension members embedded in concrete and extending in oppositely oblique directions from one series of cantalivers to another, and a roadway supported on said oblique tension members.

8. An'elevated crossing, comprising a series of .piers a plurality of series of cantalivers proj ecting from such piers toward adjacent piers, and a plurality of tension menu bers embedded in concrete and extending in oppositelyv oblique directions from one series 'of cantalivers to another.

9. An elevated crossing, comprising a series of piers, ay plurality of series of cantalivers projecting from such piers toward ndjaccnt piers, abutting cantalivers from adjacent piers being continuous, a concrete llO ' another.

l0. An elevated Crossing, comprising a ries of piers, a plurality of series of cantalivers projecting' from such piers toward adjacent piers, abutting, eantalivers from adjacent piers being continuous, and a plurality of tension members embedded in ooncrete and extending in oppositely oblique directions from one series of cantalivers to another.

1l. In combination, a bridge having a cross beam at'the end, and a plurality of separably movable spanning beams each having one end pivotal1T mounted on said cross beam and the other resting on the approach fill. y

In witness whereof' I have hereunto set my hand at Indianapolis, Indiana, this 23d day of May, A. D. one thousand nine hundred and seventeen.

DANIEL B. LUTEN. 

